Predetermined weight scale



Feb. 28, 1928. 1,660,673 H. o. HEM

PREDETERMINED WEIGHT S GALE Filed June 13. 1921 2 Sheets-Sheet 1 Il 'l |l E* l 36 i y 60 o .Ill l l a o A i Q 0 l. Q" Z3 ELI/0R 0. HEM

Feb. 28, 192s. I

1,660,673 H. O. HEM

PREDETERMINED WEIGHT SCALE Filed June 13, 1921 2 Sheets-Shea?. 2

In/undo@ Ham/012 0 HEM Patented Feb. 28, 1928.

UNITED s-'rA'r--Es PATENT Otfl.

HALVOR O. HEM, OF TOLEDO, GHIO, ASSIGNORcTO TOLEDO SCALE COMPANY, OF TOLEDO, .O1-110, A CORPOR-ATGN OF NEV JERSEY.

PREDETERFINED WEIGHT SCALE.

Application filed June 13, 1921.

rThis invention relates to weighing scales, and particularly to scales of the class known as predetermined weight scales.

One of its principal objects is to provide a soplo of comparatively great capacity having a sensitive indica-tor capable or" indicating variations from a predetermined weight in fractions of ounces.

n other object is to provide a scale of this hind having very simple load-offsetting mechanism.

Another object is to provide a scale olf this type having a combined beam lever and automat-ic load-counterbalancing device.

Another object is to provide a scale of this type having means for varying the sensitiveness of the automatic load-counterhalanoing device.

Another object the provision of a scalo having a comme(lily-receiver in the form of a hopper with a discharge chute passing downwardly through the platform lever mechanism.

Still another object is to provide a hopper scale of this type with means for protecting the platform lever mechanism from material which might otherwise fall upon it in filling the hopper.

Other objects and advantages will be apparent from the following description, in which reference is had to the accompanying drawings illustrating a preferred embodi ment of my invention and wherein similar reference numerals designate similar parts throughout the several views.

In the drawingsz- Figure 1 is an elevational view of a scale embodying my invention, parts being broken away and parts shown in section;

Figure 2 is a plan view ofthe base of the scale, showing the platform levers and the lower portion of the hopper;

Figure 3 is an enlarged detail fragmentary Aview showing the base of the scale and a part of the platform lever mechanism, with the hopper supporting frame thereon;

rFig/,ure 4 is an enlaiged detail fragmentary view showing a portion of thevcomloined lever and automatic load-offsetting device; and f Figure 5 is a sectional view taken substantiallylon the line 5 5 of Figure 1.

Referring to thedrawings in detail, the base 1 of the scale supports and houses the platform levers, comprising a long lever 2 Serial No. 477,152.

and an oppositely extending short lever 3 which is pivotally connected to the long lever 2. The long lever 2 consists of two members il and 5 which merge adjacent Vthe nose G of the lever and are connected at their divergent ends by a laterally extending member 7, Each of the members land is provided with a fulcrum pivot 8 which is supported by means of a swinging bearing 9 from the base 1 and a load pivot 10 which swingingly supports one end of a bar 11. The short lever 3 includes a laterally extending member 12 similar to the member T and a short section 13, the fulcrum pivots le and load pivots 15 of the short klever being carried by the section 13 and the extended portion 3 of the lever. The fulcrum pivots are swingingly suspended by a bearing member 1G from the basel and the load pivots swingingly support the ends of the hars 11 opposite the end supported by the load pivots 1U of the long lever.

The long lever 2 is made in the form shown for the purpose of giving it greater strength and rendering it more nearly inflexible. In cases in which such great strength is not required, it is obvious that the long lever may, like the short lever, be made of a short Section on one side supporting the load and fulcrum pivots and an extended section on the other supporting the nose pivot. Supported by means of adjustable legs 17 on the bars 11 is a hopper supporting frame 1S cons'sting essentially of an annnlus lmving lugs 19 projecting horizontally from its periphery. rlhis 'frame .1S lies within an opening in the upper side of the base. Supported by means of lugs 20 upon the frame 18 is a sloping cover 21 which extends over the opening in the upper side of the base that is occupied by the frame 18. Owing to the frusto-pyramidal shape of the cover, such n iaterial as spilled about the hopper will be deflected away from the moving parts of the scale. rEhe cover 21 is provided with a circular central opening surrounded by an upstanding flange 22 to which is secured the commodity-receiver 23, which, as shown, is in the form of a hopper having a vertical discharge chute 24 of comparatively large diameter extending downwardly through the supporting frame 18 and the platform levers. The. lower end of the discharge chute 24 is closed hy a hinged plate 25. rEhe pintle of the cover hinge is a shaft 26 having one end lll) extending beyond the side of thevbase andl having a handle 27 fixed thereto. A downwardlyV extending arm 28 is also fixed to the shaft 2G adjacent the side ofthe chute 24 and the lower end of the arm 28 is provided with an opening through which passes a rod 29 which is .slidably mounted in bearings 30 secured to the plate 25. The end of the rod 29 opposite the hinged side of the plate 25 is beveled, as shown in Figurey l, and extends into a keeper 31 mounted or secured to the Y' into the position shown in Figure l, in which the plate 25 is locked` in closed position. `When it is desired to open the lower end of the chute 24'theoperatorgrasps the handle 27 andY turns it to the right. The arm 28, being vfixed tothe shaft, presses against the head 33 on the rod 29 and thus withdraws the rod against the tension of the spring` 32 from engagement with the keeper 31. Continued turningof the shaft 26 acts through Lthe arm 28,7the head 33, the rod 29, spring 32, and one of the bearings to swing the plate 25 away from the lower end of the chute 24. I W f' p The shape of the hopper is such that when the plate 25 is swung away from the lower end of the chute the contents of the hopper are discharged in a mass without delay. rlhe hopper commodity-receiver mounted as above set yforth vis particularly useful in weighing commodities suc has dried fruits which are to be packed in boxes of definite net weights. Vhen kthe lscale is so used it may be placed above a conveyor by which 'the empty'boxes` are brought beneath the scale and are carried away when filled.

Supported at the right end of the hase l is an uprighthollow column 35 having a substantially rectangular chamber 36 at its upper end and being surmounted by a fan- -shaped housing 37. Fulcrumed within the chamber 36 is va combined beam lever and automatic load-offsetting member comprisj ing alever 38 to which are'secured parallel beams 39,- and`40 carrying poises 41 and 42. Mounted for vertical adjustment on thelever 38 is a weight 43. By moving the weight 43 upwardly or downwardly on the threaded shaft 44 by which it is supported the center of mass of the lever 38 and the parts carried thereby may beV raised or. lowered. The

Yweight 43 isso positioned that the center of mass of the lever and the parts carried therev by is below the fulcrum pivot, and thelever fright.

therefore acts as an automat-ic load-counterbalancing pendulum.

V*Secured to the lever and extending upwardly into the fan-shaped housing'37 is an indicator hand 45 which co-operates with a chart 46, the chart being-graduated to show the variation in ounces from the weight previously determined upon for the load in the commodity-receiver. If the position ofthe weight 43 is such Vthat the center of mass of the lever 38 and theparts carried thereby is considerably below the Vfulcrum pivot of the lever the ounce graduations upon the chart` 46 must be less widely spaced than if the weight 43 is adjusted so that the center of mass of the lever 38 is very little below the fulcrum pivot of the lever.

V17 hen the scale is to be used for weighing7 the poises 4l and'42 are set in positions on the beams 39 and 40 in lwhich they will exactly counterbalance a load in the commodity-receiver of the weight previouslyl determined upon. Since the-lever 38 is connected by means of a steelyard rod 47 tothenose 6 of the lever 2 and the steelyard. rod 47 is connected to the lever 38 at the left of its fulcrum, if the load in the commodityreceiver be too heavy the excess will be odset by the swing of the center of mass of-the lever 38 and partscarried thereby to the If the load be too light, the excess weight of the poises will be offset by a similar swing of the center of mass of the lever to the left.

f. By inspectionof Figure it will be noted that the bracket 48 which supports the yoke 49 containing the bearing in which the forwardfulcrum pivot of the lever 38 rests .i

extends between-the beams 39 and 40. By virtue of this construction I am enabled to avoid the undesirable overhang rwhich is present in the tare beam levers of most automatic scales. n Y

rllhe rectangular chamber 36v containing the beam levers Vmay, if desired, be equipped with a door 50 preferably hinged, as at 5l, at the top .of the chamber. This door mayVV be provided with a lock 52 so that after the poises are set and the weight' 43 is propl erly adjusted the load-offsetting mechanism of the scale cannot be read'justed or tampered with by unauthorized persons. `By, using a dischargeable hopper in connection withv a predetermined weight scale, the weighingl mechanism of vwhich maybe locked, yI haveV provided' a scale that is eX- cep'tionally well adapted for use in packing fruit, etc.

While it will be apparent that the illusf trated embodiment of my invention herein disclosed is well calculated to adequatelyy fulfill the objects primarily stated, it is to be understood that the invention is susceptible to variation, modification and change within the spirit and scope of the subjoined claims. 

